binfmt_elf.c 60.8 KB
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/*
 * linux/fs/binfmt_elf.c
 *
 * These are the functions used to load ELF format executables as used
 * on SVr4 machines.  Information on the format may be found in the book
 * "UNIX SYSTEM V RELEASE 4 Programmers Guide: Ansi C and Programming Support
 * Tools".
 *
 * Copyright 1993, 1994: Eric Youngdale (ericy@cais.com).
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/binfmts.h>
#include <linux/string.h>
#include <linux/file.h>
#include <linux/slab.h>
#include <linux/personality.h>
#include <linux/elfcore.h>
#include <linux/init.h>
#include <linux/highuid.h>
#include <linux/compiler.h>
#include <linux/highmem.h>
#include <linux/pagemap.h>
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#include <linux/vmalloc.h>
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#include <linux/security.h>
#include <linux/random.h>
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#include <linux/elf.h>
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#include <linux/elf-randomize.h>
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#include <linux/utsname.h>
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#include <linux/coredump.h>
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#include <linux/sched.h>
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#include <linux/dax.h>
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#include <asm/uaccess.h>
#include <asm/param.h>
#include <asm/page.h>

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#ifndef user_long_t
#define user_long_t long
#endif
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#ifndef user_siginfo_t
#define user_siginfo_t siginfo_t
#endif

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static int load_elf_binary(struct linux_binprm *bprm);
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static unsigned long elf_map(struct file *, unsigned long, struct elf_phdr *,
				int, int, unsigned long);
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#ifdef CONFIG_USELIB
static int load_elf_library(struct file *);
#else
#define load_elf_library NULL
#endif

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/*
 * If we don't support core dumping, then supply a NULL so we
 * don't even try.
 */
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#ifdef CONFIG_ELF_CORE
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static int elf_core_dump(struct coredump_params *cprm);
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#else
#define elf_core_dump	NULL
#endif

#if ELF_EXEC_PAGESIZE > PAGE_SIZE
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#define ELF_MIN_ALIGN	ELF_EXEC_PAGESIZE
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#else
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#define ELF_MIN_ALIGN	PAGE_SIZE
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#endif

#ifndef ELF_CORE_EFLAGS
#define ELF_CORE_EFLAGS	0
#endif

#define ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(ELF_MIN_ALIGN-1))
#define ELF_PAGEOFFSET(_v) ((_v) & (ELF_MIN_ALIGN-1))
#define ELF_PAGEALIGN(_v) (((_v) + ELF_MIN_ALIGN - 1) & ~(ELF_MIN_ALIGN - 1))

static struct linux_binfmt elf_format = {
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	.module		= THIS_MODULE,
	.load_binary	= load_elf_binary,
	.load_shlib	= load_elf_library,
	.core_dump	= elf_core_dump,
	.min_coredump	= ELF_EXEC_PAGESIZE,
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};

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#define BAD_ADDR(x) ((unsigned long)(x) >= TASK_SIZE)
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static int set_brk(unsigned long start, unsigned long end)
{
	start = ELF_PAGEALIGN(start);
	end = ELF_PAGEALIGN(end);
	if (end > start) {
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		int error = vm_brk(start, end - start);
		if (error)
			return error;
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	}
	current->mm->start_brk = current->mm->brk = end;
	return 0;
}

/* We need to explicitly zero any fractional pages
   after the data section (i.e. bss).  This would
   contain the junk from the file that should not
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   be in memory
 */
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static int padzero(unsigned long elf_bss)
{
	unsigned long nbyte;

	nbyte = ELF_PAGEOFFSET(elf_bss);
	if (nbyte) {
		nbyte = ELF_MIN_ALIGN - nbyte;
		if (clear_user((void __user *) elf_bss, nbyte))
			return -EFAULT;
	}
	return 0;
}

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/* Let's use some macros to make this stack manipulation a little clearer */
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#ifdef CONFIG_STACK_GROWSUP
#define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) + (items))
#define STACK_ROUND(sp, items) \
	((15 + (unsigned long) ((sp) + (items))) &~ 15UL)
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#define STACK_ALLOC(sp, len) ({ \
	elf_addr_t __user *old_sp = (elf_addr_t __user *)sp; sp += len; \
	old_sp; })
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#else
#define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) - (items))
#define STACK_ROUND(sp, items) \
	(((unsigned long) (sp - items)) &~ 15UL)
#define STACK_ALLOC(sp, len) ({ sp -= len ; sp; })
#endif

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#ifndef ELF_BASE_PLATFORM
/*
 * AT_BASE_PLATFORM indicates the "real" hardware/microarchitecture.
 * If the arch defines ELF_BASE_PLATFORM (in asm/elf.h), the value
 * will be copied to the user stack in the same manner as AT_PLATFORM.
 */
#define ELF_BASE_PLATFORM NULL
#endif

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static int
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create_elf_tables(struct linux_binprm *bprm, struct elfhdr *exec,
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		unsigned long load_addr, unsigned long interp_load_addr)
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{
	unsigned long p = bprm->p;
	int argc = bprm->argc;
	int envc = bprm->envc;
	elf_addr_t __user *argv;
	elf_addr_t __user *envp;
	elf_addr_t __user *sp;
	elf_addr_t __user *u_platform;
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	elf_addr_t __user *u_base_platform;
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	elf_addr_t __user *u_rand_bytes;
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	const char *k_platform = ELF_PLATFORM;
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	const char *k_base_platform = ELF_BASE_PLATFORM;
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	unsigned char k_rand_bytes[16];
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	int items;
	elf_addr_t *elf_info;
	int ei_index = 0;
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	const struct cred *cred = current_cred();
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	struct vm_area_struct *vma;
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	/*
	 * In some cases (e.g. Hyper-Threading), we want to avoid L1
	 * evictions by the processes running on the same package. One
	 * thing we can do is to shuffle the initial stack for them.
	 */

	p = arch_align_stack(p);

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	/*
	 * If this architecture has a platform capability string, copy it
	 * to userspace.  In some cases (Sparc), this info is impossible
	 * for userspace to get any other way, in others (i386) it is
	 * merely difficult.
	 */
	u_platform = NULL;
	if (k_platform) {
		size_t len = strlen(k_platform) + 1;

		u_platform = (elf_addr_t __user *)STACK_ALLOC(p, len);
		if (__copy_to_user(u_platform, k_platform, len))
			return -EFAULT;
	}

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	/*
	 * If this architecture has a "base" platform capability
	 * string, copy it to userspace.
	 */
	u_base_platform = NULL;
	if (k_base_platform) {
		size_t len = strlen(k_base_platform) + 1;

		u_base_platform = (elf_addr_t __user *)STACK_ALLOC(p, len);
		if (__copy_to_user(u_base_platform, k_base_platform, len))
			return -EFAULT;
	}

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	/*
	 * Generate 16 random bytes for userspace PRNG seeding.
	 */
	get_random_bytes(k_rand_bytes, sizeof(k_rand_bytes));
	u_rand_bytes = (elf_addr_t __user *)
		       STACK_ALLOC(p, sizeof(k_rand_bytes));
	if (__copy_to_user(u_rand_bytes, k_rand_bytes, sizeof(k_rand_bytes)))
		return -EFAULT;

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	/* Create the ELF interpreter info */
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	elf_info = (elf_addr_t *)current->mm->saved_auxv;
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	/* update AT_VECTOR_SIZE_BASE if the number of NEW_AUX_ENT() changes */
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#define NEW_AUX_ENT(id, val) \
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	do { \
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		elf_info[ei_index++] = id; \
		elf_info[ei_index++] = val; \
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	} while (0)
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#ifdef ARCH_DLINFO
	/* 
	 * ARCH_DLINFO must come first so PPC can do its special alignment of
	 * AUXV.
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	 * update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT() in
	 * ARCH_DLINFO changes
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	 */
	ARCH_DLINFO;
#endif
	NEW_AUX_ENT(AT_HWCAP, ELF_HWCAP);
	NEW_AUX_ENT(AT_PAGESZ, ELF_EXEC_PAGESIZE);
	NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC);
	NEW_AUX_ENT(AT_PHDR, load_addr + exec->e_phoff);
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	NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr));
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	NEW_AUX_ENT(AT_PHNUM, exec->e_phnum);
	NEW_AUX_ENT(AT_BASE, interp_load_addr);
	NEW_AUX_ENT(AT_FLAGS, 0);
	NEW_AUX_ENT(AT_ENTRY, exec->e_entry);
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	NEW_AUX_ENT(AT_UID, from_kuid_munged(cred->user_ns, cred->uid));
	NEW_AUX_ENT(AT_EUID, from_kuid_munged(cred->user_ns, cred->euid));
	NEW_AUX_ENT(AT_GID, from_kgid_munged(cred->user_ns, cred->gid));
	NEW_AUX_ENT(AT_EGID, from_kgid_munged(cred->user_ns, cred->egid));
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 	NEW_AUX_ENT(AT_SECURE, security_bprm_secureexec(bprm));
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	NEW_AUX_ENT(AT_RANDOM, (elf_addr_t)(unsigned long)u_rand_bytes);
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#ifdef ELF_HWCAP2
	NEW_AUX_ENT(AT_HWCAP2, ELF_HWCAP2);
#endif
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	NEW_AUX_ENT(AT_EXECFN, bprm->exec);
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	if (k_platform) {
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		NEW_AUX_ENT(AT_PLATFORM,
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			    (elf_addr_t)(unsigned long)u_platform);
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	}
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	if (k_base_platform) {
		NEW_AUX_ENT(AT_BASE_PLATFORM,
			    (elf_addr_t)(unsigned long)u_base_platform);
	}
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	if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) {
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		NEW_AUX_ENT(AT_EXECFD, bprm->interp_data);
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	}
#undef NEW_AUX_ENT
	/* AT_NULL is zero; clear the rest too */
	memset(&elf_info[ei_index], 0,
	       sizeof current->mm->saved_auxv - ei_index * sizeof elf_info[0]);

	/* And advance past the AT_NULL entry.  */
	ei_index += 2;

	sp = STACK_ADD(p, ei_index);

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	items = (argc + 1) + (envc + 1) + 1;
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	bprm->p = STACK_ROUND(sp, items);

	/* Point sp at the lowest address on the stack */
#ifdef CONFIG_STACK_GROWSUP
	sp = (elf_addr_t __user *)bprm->p - items - ei_index;
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	bprm->exec = (unsigned long)sp; /* XXX: PARISC HACK */
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#else
	sp = (elf_addr_t __user *)bprm->p;
#endif

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	/*
	 * Grow the stack manually; some architectures have a limit on how
	 * far ahead a user-space access may be in order to grow the stack.
	 */
	vma = find_extend_vma(current->mm, bprm->p);
	if (!vma)
		return -EFAULT;

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	/* Now, let's put argc (and argv, envp if appropriate) on the stack */
	if (__put_user(argc, sp++))
		return -EFAULT;
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	argv = sp;
	envp = argv + argc + 1;
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	/* Populate argv and envp */
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	p = current->mm->arg_end = current->mm->arg_start;
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	while (argc-- > 0) {
		size_t len;
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		if (__put_user((elf_addr_t)p, argv++))
			return -EFAULT;
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		len = strnlen_user((void __user *)p, MAX_ARG_STRLEN);
		if (!len || len > MAX_ARG_STRLEN)
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			return -EINVAL;
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		p += len;
	}
	if (__put_user(0, argv))
		return -EFAULT;
	current->mm->arg_end = current->mm->env_start = p;
	while (envc-- > 0) {
		size_t len;
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		if (__put_user((elf_addr_t)p, envp++))
			return -EFAULT;
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		len = strnlen_user((void __user *)p, MAX_ARG_STRLEN);
		if (!len || len > MAX_ARG_STRLEN)
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			return -EINVAL;
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		p += len;
	}
	if (__put_user(0, envp))
		return -EFAULT;
	current->mm->env_end = p;

	/* Put the elf_info on the stack in the right place.  */
	sp = (elf_addr_t __user *)envp + 1;
	if (copy_to_user(sp, elf_info, ei_index * sizeof(elf_addr_t)))
		return -EFAULT;
	return 0;
}

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#ifndef elf_map

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static unsigned long elf_map(struct file *filep, unsigned long addr,
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		struct elf_phdr *eppnt, int prot, int type,
		unsigned long total_size)
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{
	unsigned long map_addr;
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	unsigned long size = eppnt->p_filesz + ELF_PAGEOFFSET(eppnt->p_vaddr);
	unsigned long off = eppnt->p_offset - ELF_PAGEOFFSET(eppnt->p_vaddr);
	addr = ELF_PAGESTART(addr);
	size = ELF_PAGEALIGN(size);
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	/* mmap() will return -EINVAL if given a zero size, but a
	 * segment with zero filesize is perfectly valid */
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	if (!size)
		return addr;

	/*
	* total_size is the size of the ELF (interpreter) image.
	* The _first_ mmap needs to know the full size, otherwise
	* randomization might put this image into an overlapping
	* position with the ELF binary image. (since size < total_size)
	* So we first map the 'big' image - and unmap the remainder at
	* the end. (which unmap is needed for ELF images with holes.)
	*/
	if (total_size) {
		total_size = ELF_PAGEALIGN(total_size);
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		map_addr = vm_mmap(filep, addr, total_size, prot, type, off);
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		if (!BAD_ADDR(map_addr))
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			vm_munmap(map_addr+size, total_size-size);
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	} else
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		map_addr = vm_mmap(filep, addr, size, prot, type, off);
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	return(map_addr);
}

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#endif /* !elf_map */

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static unsigned long total_mapping_size(struct elf_phdr *cmds, int nr)
{
	int i, first_idx = -1, last_idx = -1;

	for (i = 0; i < nr; i++) {
		if (cmds[i].p_type == PT_LOAD) {
			last_idx = i;
			if (first_idx == -1)
				first_idx = i;
		}
	}
	if (first_idx == -1)
		return 0;

	return cmds[last_idx].p_vaddr + cmds[last_idx].p_memsz -
				ELF_PAGESTART(cmds[first_idx].p_vaddr);
}

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/**
 * load_elf_phdrs() - load ELF program headers
 * @elf_ex:   ELF header of the binary whose program headers should be loaded
 * @elf_file: the opened ELF binary file
 *
 * Loads ELF program headers from the binary file elf_file, which has the ELF
 * header pointed to by elf_ex, into a newly allocated array. The caller is
 * responsible for freeing the allocated data. Returns an ERR_PTR upon failure.
 */
static struct elf_phdr *load_elf_phdrs(struct elfhdr *elf_ex,
				       struct file *elf_file)
{
	struct elf_phdr *elf_phdata = NULL;
	int retval, size, err = -1;

	/*
	 * If the size of this structure has changed, then punt, since
	 * we will be doing the wrong thing.
	 */
	if (elf_ex->e_phentsize != sizeof(struct elf_phdr))
		goto out;

	/* Sanity check the number of program headers... */
	if (elf_ex->e_phnum < 1 ||
		elf_ex->e_phnum > 65536U / sizeof(struct elf_phdr))
		goto out;

	/* ...and their total size. */
	size = sizeof(struct elf_phdr) * elf_ex->e_phnum;
	if (size > ELF_MIN_ALIGN)
		goto out;

	elf_phdata = kmalloc(size, GFP_KERNEL);
	if (!elf_phdata)
		goto out;

	/* Read in the program headers */
	retval = kernel_read(elf_file, elf_ex->e_phoff,
			     (char *)elf_phdata, size);
	if (retval != size) {
		err = (retval < 0) ? retval : -EIO;
		goto out;
	}

	/* Success! */
	err = 0;
out:
	if (err) {
		kfree(elf_phdata);
		elf_phdata = NULL;
	}
	return elf_phdata;
}
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#ifndef CONFIG_ARCH_BINFMT_ELF_STATE

/**
 * struct arch_elf_state - arch-specific ELF loading state
 *
 * This structure is used to preserve architecture specific data during
 * the loading of an ELF file, throughout the checking of architecture
 * specific ELF headers & through to the point where the ELF load is
 * known to be proceeding (ie. SET_PERSONALITY).
 *
 * This implementation is a dummy for architectures which require no
 * specific state.
 */
struct arch_elf_state {
};

#define INIT_ARCH_ELF_STATE {}

/**
 * arch_elf_pt_proc() - check a PT_LOPROC..PT_HIPROC ELF program header
 * @ehdr:	The main ELF header
 * @phdr:	The program header to check
 * @elf:	The open ELF file
 * @is_interp:	True if the phdr is from the interpreter of the ELF being
 *		loaded, else false.
 * @state:	Architecture-specific state preserved throughout the process
 *		of loading the ELF.
 *
 * Inspects the program header phdr to validate its correctness and/or
 * suitability for the system. Called once per ELF program header in the
 * range PT_LOPROC to PT_HIPROC, for both the ELF being loaded and its
 * interpreter.
 *
 * Return: Zero to proceed with the ELF load, non-zero to fail the ELF load
 *         with that return code.
 */
static inline int arch_elf_pt_proc(struct elfhdr *ehdr,
				   struct elf_phdr *phdr,
				   struct file *elf, bool is_interp,
				   struct arch_elf_state *state)
{
	/* Dummy implementation, always proceed */
	return 0;
}

/**
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 * arch_check_elf() - check an ELF executable
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 * @ehdr:	The main ELF header
 * @has_interp:	True if the ELF has an interpreter, else false.
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 * @interp_ehdr: The interpreter's ELF header
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 * @state:	Architecture-specific state preserved throughout the process
 *		of loading the ELF.
 *
 * Provides a final opportunity for architecture code to reject the loading
 * of the ELF & cause an exec syscall to return an error. This is called after
 * all program headers to be checked by arch_elf_pt_proc have been.
 *
 * Return: Zero to proceed with the ELF load, non-zero to fail the ELF load
 *         with that return code.
 */
static inline int arch_check_elf(struct elfhdr *ehdr, bool has_interp,
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				 struct elfhdr *interp_ehdr,
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				 struct arch_elf_state *state)
{
	/* Dummy implementation, always proceed */
	return 0;
}

#endif /* !CONFIG_ARCH_BINFMT_ELF_STATE */
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/* This is much more generalized than the library routine read function,
   so we keep this separate.  Technically the library read function
   is only provided so that we can read a.out libraries that have
   an ELF header */

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static unsigned long load_elf_interp(struct elfhdr *interp_elf_ex,
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		struct file *interpreter, unsigned long *interp_map_addr,
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		unsigned long no_base, struct elf_phdr *interp_elf_phdata)
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{
	struct elf_phdr *eppnt;
	unsigned long load_addr = 0;
	int load_addr_set = 0;
	unsigned long last_bss = 0, elf_bss = 0;
	unsigned long error = ~0UL;
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	unsigned long total_size;
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	int i;
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	/* First of all, some simple consistency checks */
	if (interp_elf_ex->e_type != ET_EXEC &&
	    interp_elf_ex->e_type != ET_DYN)
		goto out;
	if (!elf_check_arch(interp_elf_ex))
		goto out;
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	if (!interpreter->f_op->mmap)
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		goto out;

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	total_size = total_mapping_size(interp_elf_phdata,
					interp_elf_ex->e_phnum);
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	if (!total_size) {
		error = -EINVAL;
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		goto out;
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	}

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	eppnt = interp_elf_phdata;
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	for (i = 0; i < interp_elf_ex->e_phnum; i++, eppnt++) {
		if (eppnt->p_type == PT_LOAD) {
			int elf_type = MAP_PRIVATE | MAP_DENYWRITE;
			int elf_prot = 0;
			unsigned long vaddr = 0;
			unsigned long k, map_addr;

			if (eppnt->p_flags & PF_R)
		    		elf_prot = PROT_READ;
			if (eppnt->p_flags & PF_W)
				elf_prot |= PROT_WRITE;
			if (eppnt->p_flags & PF_X)
				elf_prot |= PROT_EXEC;
			vaddr = eppnt->p_vaddr;
			if (interp_elf_ex->e_type == ET_EXEC || load_addr_set)
				elf_type |= MAP_FIXED;
J
Jiri Kosina 已提交
564 565
			else if (no_base && interp_elf_ex->e_type == ET_DYN)
				load_addr = -vaddr;
566 567

			map_addr = elf_map(interpreter, load_addr + vaddr,
568
					eppnt, elf_prot, elf_type, total_size);
J
Jiri Kosina 已提交
569 570 571
			total_size = 0;
			if (!*interp_map_addr)
				*interp_map_addr = map_addr;
572 573
			error = map_addr;
			if (BAD_ADDR(map_addr))
574
				goto out;
575 576 577 578 579 580 581 582 583 584 585 586 587

			if (!load_addr_set &&
			    interp_elf_ex->e_type == ET_DYN) {
				load_addr = map_addr - ELF_PAGESTART(vaddr);
				load_addr_set = 1;
			}

			/*
			 * Check to see if the section's size will overflow the
			 * allowed task size. Note that p_filesz must always be
			 * <= p_memsize so it's only necessary to check p_memsz.
			 */
			k = load_addr + eppnt->p_vaddr;
588
			if (BAD_ADDR(k) ||
589 590 591 592
			    eppnt->p_filesz > eppnt->p_memsz ||
			    eppnt->p_memsz > TASK_SIZE ||
			    TASK_SIZE - eppnt->p_memsz < k) {
				error = -ENOMEM;
593
				goto out;
594 595 596 597 598 599 600 601 602 603 604 605 606 607
			}

			/*
			 * Find the end of the file mapping for this phdr, and
			 * keep track of the largest address we see for this.
			 */
			k = load_addr + eppnt->p_vaddr + eppnt->p_filesz;
			if (k > elf_bss)
				elf_bss = k;

			/*
			 * Do the same thing for the memory mapping - between
			 * elf_bss and last_bss is the bss section.
			 */
608
			k = load_addr + eppnt->p_vaddr + eppnt->p_memsz;
609 610 611
			if (k > last_bss)
				last_bss = k;
		}
L
Linus Torvalds 已提交
612 613
	}

614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630
	/*
	 * Now fill out the bss section: first pad the last page from
	 * the file up to the page boundary, and zero it from elf_bss
	 * up to the end of the page.
	 */
	if (padzero(elf_bss)) {
		error = -EFAULT;
		goto out;
	}
	/*
	 * Next, align both the file and mem bss up to the page size,
	 * since this is where elf_bss was just zeroed up to, and where
	 * last_bss will end after the vm_brk() below.
	 */
	elf_bss = ELF_PAGEALIGN(elf_bss);
	last_bss = ELF_PAGEALIGN(last_bss);
	/* Finally, if there is still more bss to allocate, do it. */
631
	if (last_bss > elf_bss) {
632
		error = vm_brk(elf_bss, last_bss - elf_bss);
633
		if (error)
634
			goto out;
L
Linus Torvalds 已提交
635 636
	}

J
Jiri Kosina 已提交
637
	error = load_addr;
L
Linus Torvalds 已提交
638 639 640 641 642 643 644 645 646
out:
	return error;
}

/*
 * These are the functions used to load ELF style executables and shared
 * libraries.  There is no binary dependent code anywhere else.
 */

647
#ifndef STACK_RND_MASK
648
#define STACK_RND_MASK (0x7ff >> (PAGE_SHIFT - 12))	/* 8MB of VA */
649
#endif
L
Linus Torvalds 已提交
650 651 652

static unsigned long randomize_stack_top(unsigned long stack_top)
{
653
	unsigned long random_variable = 0;
L
Linus Torvalds 已提交
654

655 656
	if ((current->flags & PF_RANDOMIZE) &&
		!(current->personality & ADDR_NO_RANDOMIZE)) {
D
Daniel Cashman 已提交
657
		random_variable = get_random_long();
658
		random_variable &= STACK_RND_MASK;
659 660
		random_variable <<= PAGE_SHIFT;
	}
L
Linus Torvalds 已提交
661
#ifdef CONFIG_STACK_GROWSUP
662
	return PAGE_ALIGN(stack_top) + random_variable;
L
Linus Torvalds 已提交
663
#else
664
	return PAGE_ALIGN(stack_top) - random_variable;
L
Linus Torvalds 已提交
665 666 667
#endif
}

668
static int load_elf_binary(struct linux_binprm *bprm)
L
Linus Torvalds 已提交
669 670 671 672 673 674
{
	struct file *interpreter = NULL; /* to shut gcc up */
 	unsigned long load_addr = 0, load_bias = 0;
	int load_addr_set = 0;
	char * elf_interpreter = NULL;
	unsigned long error;
675
	struct elf_phdr *elf_ppnt, *elf_phdata, *interp_elf_phdata = NULL;
L
Linus Torvalds 已提交
676 677
	unsigned long elf_bss, elf_brk;
	int retval, i;
J
Jiri Kosina 已提交
678 679
	unsigned long elf_entry;
	unsigned long interp_load_addr = 0;
L
Linus Torvalds 已提交
680
	unsigned long start_code, end_code, start_data, end_data;
681
	unsigned long reloc_func_desc __maybe_unused = 0;
682
	int executable_stack = EXSTACK_DEFAULT;
683
	struct pt_regs *regs = current_pt_regs();
L
Linus Torvalds 已提交
684 685 686 687
	struct {
		struct elfhdr elf_ex;
		struct elfhdr interp_elf_ex;
	} *loc;
688
	struct arch_elf_state arch_state = INIT_ARCH_ELF_STATE;
L
Linus Torvalds 已提交
689 690 691 692 693 694 695 696

	loc = kmalloc(sizeof(*loc), GFP_KERNEL);
	if (!loc) {
		retval = -ENOMEM;
		goto out_ret;
	}
	
	/* Get the exec-header */
697
	loc->elf_ex = *((struct elfhdr *)bprm->buf);
L
Linus Torvalds 已提交
698 699 700 701 702 703 704 705 706 707

	retval = -ENOEXEC;
	/* First of all, some simple consistency checks */
	if (memcmp(loc->elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
		goto out;

	if (loc->elf_ex.e_type != ET_EXEC && loc->elf_ex.e_type != ET_DYN)
		goto out;
	if (!elf_check_arch(&loc->elf_ex))
		goto out;
A
Al Viro 已提交
708
	if (!bprm->file->f_op->mmap)
L
Linus Torvalds 已提交
709 710
		goto out;

711
	elf_phdata = load_elf_phdrs(&loc->elf_ex, bprm->file);
L
Linus Torvalds 已提交
712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732
	if (!elf_phdata)
		goto out;

	elf_ppnt = elf_phdata;
	elf_bss = 0;
	elf_brk = 0;

	start_code = ~0UL;
	end_code = 0;
	start_data = 0;
	end_data = 0;

	for (i = 0; i < loc->elf_ex.e_phnum; i++) {
		if (elf_ppnt->p_type == PT_INTERP) {
			/* This is the program interpreter used for
			 * shared libraries - for now assume that this
			 * is an a.out format binary
			 */
			retval = -ENOEXEC;
			if (elf_ppnt->p_filesz > PATH_MAX || 
			    elf_ppnt->p_filesz < 2)
733
				goto out_free_ph;
L
Linus Torvalds 已提交
734 735

			retval = -ENOMEM;
736
			elf_interpreter = kmalloc(elf_ppnt->p_filesz,
737
						  GFP_KERNEL);
L
Linus Torvalds 已提交
738
			if (!elf_interpreter)
739
				goto out_free_ph;
L
Linus Torvalds 已提交
740 741

			retval = kernel_read(bprm->file, elf_ppnt->p_offset,
742 743
					     elf_interpreter,
					     elf_ppnt->p_filesz);
L
Linus Torvalds 已提交
744 745 746 747 748 749 750 751 752 753 754 755 756 757
			if (retval != elf_ppnt->p_filesz) {
				if (retval >= 0)
					retval = -EIO;
				goto out_free_interp;
			}
			/* make sure path is NULL terminated */
			retval = -ENOEXEC;
			if (elf_interpreter[elf_ppnt->p_filesz - 1] != '\0')
				goto out_free_interp;

			interpreter = open_exec(elf_interpreter);
			retval = PTR_ERR(interpreter);
			if (IS_ERR(interpreter))
				goto out_free_interp;
758 759 760 761 762 763

			/*
			 * If the binary is not readable then enforce
			 * mm->dumpable = 0 regardless of the interpreter's
			 * permissions.
			 */
764
			would_dump(bprm, interpreter);
765

766 767 768 769 770
			/* Get the exec headers */
			retval = kernel_read(interpreter, 0,
					     (void *)&loc->interp_elf_ex,
					     sizeof(loc->interp_elf_ex));
			if (retval != sizeof(loc->interp_elf_ex)) {
L
Linus Torvalds 已提交
771 772 773 774 775 776 777 778 779 780 781 782
				if (retval >= 0)
					retval = -EIO;
				goto out_free_dentry;
			}

			break;
		}
		elf_ppnt++;
	}

	elf_ppnt = elf_phdata;
	for (i = 0; i < loc->elf_ex.e_phnum; i++, elf_ppnt++)
783 784
		switch (elf_ppnt->p_type) {
		case PT_GNU_STACK:
L
Linus Torvalds 已提交
785 786 787 788 789
			if (elf_ppnt->p_flags & PF_X)
				executable_stack = EXSTACK_ENABLE_X;
			else
				executable_stack = EXSTACK_DISABLE_X;
			break;
790 791 792 793 794 795 796 797

		case PT_LOPROC ... PT_HIPROC:
			retval = arch_elf_pt_proc(&loc->elf_ex, elf_ppnt,
						  bprm->file, false,
						  &arch_state);
			if (retval)
				goto out_free_dentry;
			break;
L
Linus Torvalds 已提交
798 799 800 801 802
		}

	/* Some simple consistency checks for the interpreter */
	if (elf_interpreter) {
		retval = -ELIBBAD;
803 804
		/* Not an ELF interpreter */
		if (memcmp(loc->interp_elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
L
Linus Torvalds 已提交
805 806
			goto out_free_dentry;
		/* Verify the interpreter has a valid arch */
807
		if (!elf_check_arch(&loc->interp_elf_ex))
L
Linus Torvalds 已提交
808
			goto out_free_dentry;
809 810 811 812 813 814

		/* Load the interpreter program headers */
		interp_elf_phdata = load_elf_phdrs(&loc->interp_elf_ex,
						   interpreter);
		if (!interp_elf_phdata)
			goto out_free_dentry;
815 816 817 818 819 820 821 822 823 824 825 826 827

		/* Pass PT_LOPROC..PT_HIPROC headers to arch code */
		elf_ppnt = interp_elf_phdata;
		for (i = 0; i < loc->interp_elf_ex.e_phnum; i++, elf_ppnt++)
			switch (elf_ppnt->p_type) {
			case PT_LOPROC ... PT_HIPROC:
				retval = arch_elf_pt_proc(&loc->interp_elf_ex,
							  elf_ppnt, interpreter,
							  true, &arch_state);
				if (retval)
					goto out_free_dentry;
				break;
			}
L
Linus Torvalds 已提交
828 829
	}

830 831 832 833 834
	/*
	 * Allow arch code to reject the ELF at this point, whilst it's
	 * still possible to return an error to the code that invoked
	 * the exec syscall.
	 */
835 836 837
	retval = arch_check_elf(&loc->elf_ex,
				!!interpreter, &loc->interp_elf_ex,
				&arch_state);
838 839 840
	if (retval)
		goto out_free_dentry;

L
Linus Torvalds 已提交
841 842 843 844 845 846 847
	/* Flush all traces of the currently running executable */
	retval = flush_old_exec(bprm);
	if (retval)
		goto out_free_dentry;

	/* Do this immediately, since STACK_TOP as used in setup_arg_pages
	   may depend on the personality.  */
848
	SET_PERSONALITY2(loc->elf_ex, &arch_state);
L
Linus Torvalds 已提交
849 850 851
	if (elf_read_implies_exec(loc->elf_ex, executable_stack))
		current->personality |= READ_IMPLIES_EXEC;

852
	if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
L
Linus Torvalds 已提交
853
		current->flags |= PF_RANDOMIZE;
854 855

	setup_new_exec(bprm);
856
	install_exec_creds(bprm);
L
Linus Torvalds 已提交
857 858 859 860 861

	/* Do this so that we can load the interpreter, if need be.  We will
	   change some of these later */
	retval = setup_arg_pages(bprm, randomize_stack_top(STACK_TOP),
				 executable_stack);
862
	if (retval < 0)
L
Linus Torvalds 已提交
863 864 865 866
		goto out_free_dentry;
	
	current->mm->start_stack = bprm->p;

867
	/* Now we do a little grungy work by mmapping the ELF image into
J
Jiri Kosina 已提交
868
	   the correct location in memory. */
869 870
	for(i = 0, elf_ppnt = elf_phdata;
	    i < loc->elf_ex.e_phnum; i++, elf_ppnt++) {
L
Linus Torvalds 已提交
871 872
		int elf_prot = 0, elf_flags;
		unsigned long k, vaddr;
873
		unsigned long total_size = 0;
L
Linus Torvalds 已提交
874 875 876 877 878 879 880 881 882 883

		if (elf_ppnt->p_type != PT_LOAD)
			continue;

		if (unlikely (elf_brk > elf_bss)) {
			unsigned long nbyte;
	            
			/* There was a PT_LOAD segment with p_memsz > p_filesz
			   before this one. Map anonymous pages, if needed,
			   and clear the area.  */
M
Mikael Pettersson 已提交
884 885
			retval = set_brk(elf_bss + load_bias,
					 elf_brk + load_bias);
886
			if (retval)
L
Linus Torvalds 已提交
887 888 889 890 891 892 893 894 895 896
				goto out_free_dentry;
			nbyte = ELF_PAGEOFFSET(elf_bss);
			if (nbyte) {
				nbyte = ELF_MIN_ALIGN - nbyte;
				if (nbyte > elf_brk - elf_bss)
					nbyte = elf_brk - elf_bss;
				if (clear_user((void __user *)elf_bss +
							load_bias, nbyte)) {
					/*
					 * This bss-zeroing can fail if the ELF
897
					 * file specifies odd protections. So
L
Linus Torvalds 已提交
898 899 900 901 902 903
					 * we don't check the return value
					 */
				}
			}
		}

904 905 906 907 908 909
		if (elf_ppnt->p_flags & PF_R)
			elf_prot |= PROT_READ;
		if (elf_ppnt->p_flags & PF_W)
			elf_prot |= PROT_WRITE;
		if (elf_ppnt->p_flags & PF_X)
			elf_prot |= PROT_EXEC;
L
Linus Torvalds 已提交
910

911
		elf_flags = MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE;
L
Linus Torvalds 已提交
912 913 914 915 916

		vaddr = elf_ppnt->p_vaddr;
		if (loc->elf_ex.e_type == ET_EXEC || load_addr_set) {
			elf_flags |= MAP_FIXED;
		} else if (loc->elf_ex.e_type == ET_DYN) {
917 918 919 920
			/* Try and get dynamic programs out of the way of the
			 * default mmap base, as well as whatever program they
			 * might try to exec.  This is because the brk will
			 * follow the loader, and is not movable.  */
K
Kees Cook 已提交
921
			load_bias = ELF_ET_DYN_BASE - vaddr;
922
			if (current->flags & PF_RANDOMIZE)
K
Kees Cook 已提交
923 924
				load_bias += arch_mmap_rnd();
			load_bias = ELF_PAGESTART(load_bias);
925 926 927
			total_size = total_mapping_size(elf_phdata,
							loc->elf_ex.e_phnum);
			if (!total_size) {
928
				retval = -EINVAL;
929 930
				goto out_free_dentry;
			}
L
Linus Torvalds 已提交
931 932
		}

933
		error = elf_map(bprm->file, load_bias + vaddr, elf_ppnt,
934
				elf_prot, elf_flags, total_size);
L
Linus Torvalds 已提交
935
		if (BAD_ADDR(error)) {
936 937
			retval = IS_ERR((void *)error) ?
				PTR_ERR((void*)error) : -EINVAL;
L
Linus Torvalds 已提交
938 939 940 941 942 943 944 945 946 947 948 949 950 951
			goto out_free_dentry;
		}

		if (!load_addr_set) {
			load_addr_set = 1;
			load_addr = (elf_ppnt->p_vaddr - elf_ppnt->p_offset);
			if (loc->elf_ex.e_type == ET_DYN) {
				load_bias += error -
				             ELF_PAGESTART(load_bias + vaddr);
				load_addr += load_bias;
				reloc_func_desc = load_bias;
			}
		}
		k = elf_ppnt->p_vaddr;
952 953 954 955
		if (k < start_code)
			start_code = k;
		if (start_data < k)
			start_data = k;
L
Linus Torvalds 已提交
956 957 958 959 960 961

		/*
		 * Check to see if the section's size will overflow the
		 * allowed task size. Note that p_filesz must always be
		 * <= p_memsz so it is only necessary to check p_memsz.
		 */
962
		if (BAD_ADDR(k) || elf_ppnt->p_filesz > elf_ppnt->p_memsz ||
L
Linus Torvalds 已提交
963 964
		    elf_ppnt->p_memsz > TASK_SIZE ||
		    TASK_SIZE - elf_ppnt->p_memsz < k) {
965
			/* set_brk can never work. Avoid overflows. */
966
			retval = -EINVAL;
L
Linus Torvalds 已提交
967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996
			goto out_free_dentry;
		}

		k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz;

		if (k > elf_bss)
			elf_bss = k;
		if ((elf_ppnt->p_flags & PF_X) && end_code < k)
			end_code = k;
		if (end_data < k)
			end_data = k;
		k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz;
		if (k > elf_brk)
			elf_brk = k;
	}

	loc->elf_ex.e_entry += load_bias;
	elf_bss += load_bias;
	elf_brk += load_bias;
	start_code += load_bias;
	end_code += load_bias;
	start_data += load_bias;
	end_data += load_bias;

	/* Calling set_brk effectively mmaps the pages that we need
	 * for the bss and break sections.  We must do this before
	 * mapping in the interpreter, to make sure it doesn't wind
	 * up getting placed where the bss needs to go.
	 */
	retval = set_brk(elf_bss, elf_brk);
997
	if (retval)
L
Linus Torvalds 已提交
998
		goto out_free_dentry;
A
akpm@osdl.org 已提交
999
	if (likely(elf_bss != elf_brk) && unlikely(padzero(elf_bss))) {
L
Linus Torvalds 已提交
1000 1001 1002 1003 1004
		retval = -EFAULT; /* Nobody gets to see this, but.. */
		goto out_free_dentry;
	}

	if (elf_interpreter) {
A
Alan Cox 已提交
1005
		unsigned long interp_map_addr = 0;
1006 1007 1008 1009

		elf_entry = load_elf_interp(&loc->interp_elf_ex,
					    interpreter,
					    &interp_map_addr,
1010
					    load_bias, interp_elf_phdata);
1011 1012 1013 1014 1015 1016 1017
		if (!IS_ERR((void *)elf_entry)) {
			/*
			 * load_elf_interp() returns relocation
			 * adjustment
			 */
			interp_load_addr = elf_entry;
			elf_entry += loc->interp_elf_ex.e_entry;
J
Jiri Kosina 已提交
1018
		}
L
Linus Torvalds 已提交
1019
		if (BAD_ADDR(elf_entry)) {
1020 1021
			retval = IS_ERR((void *)elf_entry) ?
					(int)elf_entry : -EINVAL;
L
Linus Torvalds 已提交
1022 1023 1024 1025 1026 1027 1028 1029 1030
			goto out_free_dentry;
		}
		reloc_func_desc = interp_load_addr;

		allow_write_access(interpreter);
		fput(interpreter);
		kfree(elf_interpreter);
	} else {
		elf_entry = loc->elf_ex.e_entry;
1031
		if (BAD_ADDR(elf_entry)) {
1032
			retval = -EINVAL;
1033 1034
			goto out_free_dentry;
		}
L
Linus Torvalds 已提交
1035 1036
	}

1037
	kfree(interp_elf_phdata);
L
Linus Torvalds 已提交
1038 1039 1040 1041
	kfree(elf_phdata);

	set_binfmt(&elf_format);

1042
#ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES
1043
	retval = arch_setup_additional_pages(bprm, !!elf_interpreter);
1044
	if (retval < 0)
1045
		goto out;
1046 1047
#endif /* ARCH_HAS_SETUP_ADDITIONAL_PAGES */

1048
	retval = create_elf_tables(bprm, &loc->elf_ex,
1049
			  load_addr, interp_load_addr);
1050
	if (retval < 0)
1051
		goto out;
L
Linus Torvalds 已提交
1052 1053 1054 1055 1056 1057 1058
	/* N.B. passed_fileno might not be initialized? */
	current->mm->end_code = end_code;
	current->mm->start_code = start_code;
	current->mm->start_data = start_data;
	current->mm->end_data = end_data;
	current->mm->start_stack = bprm->p;

1059
	if ((current->flags & PF_RANDOMIZE) && (randomize_va_space > 1)) {
J
Jiri Kosina 已提交
1060 1061
		current->mm->brk = current->mm->start_brk =
			arch_randomize_brk(current->mm);
1062
#ifdef compat_brk_randomized
1063 1064 1065
		current->brk_randomized = 1;
#endif
	}
J
Jiri Kosina 已提交
1066

L
Linus Torvalds 已提交
1067 1068 1069 1070
	if (current->personality & MMAP_PAGE_ZERO) {
		/* Why this, you ask???  Well SVr4 maps page 0 as read-only,
		   and some applications "depend" upon this behavior.
		   Since we do not have the power to recompile these, we
1071
		   emulate the SVr4 behavior. Sigh. */
1072
		error = vm_mmap(NULL, 0, PAGE_SIZE, PROT_READ | PROT_EXEC,
L
Linus Torvalds 已提交
1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098
				MAP_FIXED | MAP_PRIVATE, 0);
	}

#ifdef ELF_PLAT_INIT
	/*
	 * The ABI may specify that certain registers be set up in special
	 * ways (on i386 %edx is the address of a DT_FINI function, for
	 * example.  In addition, it may also specify (eg, PowerPC64 ELF)
	 * that the e_entry field is the address of the function descriptor
	 * for the startup routine, rather than the address of the startup
	 * routine itself.  This macro performs whatever initialization to
	 * the regs structure is required as well as any relocations to the
	 * function descriptor entries when executing dynamically links apps.
	 */
	ELF_PLAT_INIT(regs, reloc_func_desc);
#endif

	start_thread(regs, elf_entry, bprm->p);
	retval = 0;
out:
	kfree(loc);
out_ret:
	return retval;

	/* error cleanup */
out_free_dentry:
1099
	kfree(interp_elf_phdata);
L
Linus Torvalds 已提交
1100 1101 1102 1103
	allow_write_access(interpreter);
	if (interpreter)
		fput(interpreter);
out_free_interp:
J
Jesper Juhl 已提交
1104
	kfree(elf_interpreter);
L
Linus Torvalds 已提交
1105 1106 1107 1108 1109
out_free_ph:
	kfree(elf_phdata);
	goto out;
}

1110
#ifdef CONFIG_USELIB
L
Linus Torvalds 已提交
1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121
/* This is really simpleminded and specialized - we are loading an
   a.out library that is given an ELF header. */
static int load_elf_library(struct file *file)
{
	struct elf_phdr *elf_phdata;
	struct elf_phdr *eppnt;
	unsigned long elf_bss, bss, len;
	int retval, error, i, j;
	struct elfhdr elf_ex;

	error = -ENOEXEC;
1122
	retval = kernel_read(file, 0, (char *)&elf_ex, sizeof(elf_ex));
L
Linus Torvalds 已提交
1123 1124 1125 1126 1127 1128 1129 1130
	if (retval != sizeof(elf_ex))
		goto out;

	if (memcmp(elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
		goto out;

	/* First of all, some simple consistency checks */
	if (elf_ex.e_type != ET_EXEC || elf_ex.e_phnum > 2 ||
A
Al Viro 已提交
1131
	    !elf_check_arch(&elf_ex) || !file->f_op->mmap)
L
Linus Torvalds 已提交
1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159
		goto out;

	/* Now read in all of the header information */

	j = sizeof(struct elf_phdr) * elf_ex.e_phnum;
	/* j < ELF_MIN_ALIGN because elf_ex.e_phnum <= 2 */

	error = -ENOMEM;
	elf_phdata = kmalloc(j, GFP_KERNEL);
	if (!elf_phdata)
		goto out;

	eppnt = elf_phdata;
	error = -ENOEXEC;
	retval = kernel_read(file, elf_ex.e_phoff, (char *)eppnt, j);
	if (retval != j)
		goto out_free_ph;

	for (j = 0, i = 0; i<elf_ex.e_phnum; i++)
		if ((eppnt + i)->p_type == PT_LOAD)
			j++;
	if (j != 1)
		goto out_free_ph;

	while (eppnt->p_type != PT_LOAD)
		eppnt++;

	/* Now use mmap to map the library into memory. */
1160
	error = vm_mmap(file,
L
Linus Torvalds 已提交
1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176
			ELF_PAGESTART(eppnt->p_vaddr),
			(eppnt->p_filesz +
			 ELF_PAGEOFFSET(eppnt->p_vaddr)),
			PROT_READ | PROT_WRITE | PROT_EXEC,
			MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE,
			(eppnt->p_offset -
			 ELF_PAGEOFFSET(eppnt->p_vaddr)));
	if (error != ELF_PAGESTART(eppnt->p_vaddr))
		goto out_free_ph;

	elf_bss = eppnt->p_vaddr + eppnt->p_filesz;
	if (padzero(elf_bss)) {
		error = -EFAULT;
		goto out_free_ph;
	}

1177 1178
	len = ELF_PAGESTART(eppnt->p_filesz + eppnt->p_vaddr +
			    ELF_MIN_ALIGN - 1);
L
Linus Torvalds 已提交
1179
	bss = eppnt->p_memsz + eppnt->p_vaddr;
M
Michal Hocko 已提交
1180 1181
	if (bss > len) {
		error = vm_brk(len, bss - len);
1182
		if (error)
M
Michal Hocko 已提交
1183 1184
			goto out_free_ph;
	}
L
Linus Torvalds 已提交
1185 1186 1187 1188 1189 1190 1191
	error = 0;

out_free_ph:
	kfree(elf_phdata);
out:
	return error;
}
1192
#endif /* #ifdef CONFIG_USELIB */
L
Linus Torvalds 已提交
1193

C
Christoph Hellwig 已提交
1194
#ifdef CONFIG_ELF_CORE
L
Linus Torvalds 已提交
1195 1196 1197 1198 1199 1200 1201
/*
 * ELF core dumper
 *
 * Modelled on fs/exec.c:aout_core_dump()
 * Jeremy Fitzhardinge <jeremy@sw.oz.au>
 */

1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214
/*
 * The purpose of always_dump_vma() is to make sure that special kernel mappings
 * that are useful for post-mortem analysis are included in every core dump.
 * In that way we ensure that the core dump is fully interpretable later
 * without matching up the same kernel and hardware config to see what PC values
 * meant. These special mappings include - vDSO, vsyscall, and other
 * architecture specific mappings
 */
static bool always_dump_vma(struct vm_area_struct *vma)
{
	/* Any vsyscall mappings? */
	if (vma == get_gate_vma(vma->vm_mm))
		return true;
1215 1216 1217 1218 1219 1220 1221 1222

	/*
	 * Assume that all vmas with a .name op should always be dumped.
	 * If this changes, a new vm_ops field can easily be added.
	 */
	if (vma->vm_ops && vma->vm_ops->name && vma->vm_ops->name(vma))
		return true;

1223 1224 1225 1226 1227 1228 1229 1230 1231 1232
	/*
	 * arch_vma_name() returns non-NULL for special architecture mappings,
	 * such as vDSO sections.
	 */
	if (arch_vma_name(vma))
		return true;

	return false;
}

L
Linus Torvalds 已提交
1233
/*
R
Roland McGrath 已提交
1234
 * Decide what to dump of a segment, part, all or none.
L
Linus Torvalds 已提交
1235
 */
R
Roland McGrath 已提交
1236 1237
static unsigned long vma_dump_size(struct vm_area_struct *vma,
				   unsigned long mm_flags)
L
Linus Torvalds 已提交
1238
{
1239 1240
#define FILTER(type)	(mm_flags & (1UL << MMF_DUMP_##type))

1241 1242
	/* always dump the vdso and vsyscall sections */
	if (always_dump_vma(vma))
R
Roland McGrath 已提交
1243
		goto whole;
R
Roland McGrath 已提交
1244

1245
	if (vma->vm_flags & VM_DONTDUMP)
1246 1247
		return 0;

1248 1249 1250 1251 1252 1253 1254 1255 1256
	/* support for DAX */
	if (vma_is_dax(vma)) {
		if ((vma->vm_flags & VM_SHARED) && FILTER(DAX_SHARED))
			goto whole;
		if (!(vma->vm_flags & VM_SHARED) && FILTER(DAX_PRIVATE))
			goto whole;
		return 0;
	}

1257 1258 1259 1260 1261 1262
	/* Hugetlb memory check */
	if (vma->vm_flags & VM_HUGETLB) {
		if ((vma->vm_flags & VM_SHARED) && FILTER(HUGETLB_SHARED))
			goto whole;
		if (!(vma->vm_flags & VM_SHARED) && FILTER(HUGETLB_PRIVATE))
			goto whole;
1263
		return 0;
1264 1265
	}

L
Linus Torvalds 已提交
1266
	/* Do not dump I/O mapped devices or special mappings */
1267
	if (vma->vm_flags & VM_IO)
L
Linus Torvalds 已提交
1268 1269
		return 0;

1270 1271
	/* By default, dump shared memory if mapped from an anonymous file. */
	if (vma->vm_flags & VM_SHARED) {
A
Al Viro 已提交
1272
		if (file_inode(vma->vm_file)->i_nlink == 0 ?
R
Roland McGrath 已提交
1273 1274 1275
		    FILTER(ANON_SHARED) : FILTER(MAPPED_SHARED))
			goto whole;
		return 0;
1276
	}
L
Linus Torvalds 已提交
1277

R
Roland McGrath 已提交
1278 1279 1280 1281 1282
	/* Dump segments that have been written to.  */
	if (vma->anon_vma && FILTER(ANON_PRIVATE))
		goto whole;
	if (vma->vm_file == NULL)
		return 0;
L
Linus Torvalds 已提交
1283

R
Roland McGrath 已提交
1284 1285 1286 1287 1288 1289 1290 1291
	if (FILTER(MAPPED_PRIVATE))
		goto whole;

	/*
	 * If this looks like the beginning of a DSO or executable mapping,
	 * check for an ELF header.  If we find one, dump the first page to
	 * aid in determining what was mapped here.
	 */
R
Roland McGrath 已提交
1292 1293
	if (FILTER(ELF_HEADERS) &&
	    vma->vm_pgoff == 0 && (vma->vm_flags & VM_READ)) {
R
Roland McGrath 已提交
1294 1295
		u32 __user *header = (u32 __user *) vma->vm_start;
		u32 word;
R
Roland McGrath 已提交
1296
		mm_segment_t fs = get_fs();
R
Roland McGrath 已提交
1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308
		/*
		 * Doing it this way gets the constant folded by GCC.
		 */
		union {
			u32 cmp;
			char elfmag[SELFMAG];
		} magic;
		BUILD_BUG_ON(SELFMAG != sizeof word);
		magic.elfmag[EI_MAG0] = ELFMAG0;
		magic.elfmag[EI_MAG1] = ELFMAG1;
		magic.elfmag[EI_MAG2] = ELFMAG2;
		magic.elfmag[EI_MAG3] = ELFMAG3;
R
Roland McGrath 已提交
1309 1310 1311 1312 1313 1314 1315 1316 1317
		/*
		 * Switch to the user "segment" for get_user(),
		 * then put back what elf_core_dump() had in place.
		 */
		set_fs(USER_DS);
		if (unlikely(get_user(word, header)))
			word = 0;
		set_fs(fs);
		if (word == magic.cmp)
R
Roland McGrath 已提交
1318 1319 1320 1321 1322 1323 1324 1325 1326
			return PAGE_SIZE;
	}

#undef	FILTER

	return 0;

whole:
	return vma->vm_end - vma->vm_start;
L
Linus Torvalds 已提交
1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348
}

/* An ELF note in memory */
struct memelfnote
{
	const char *name;
	int type;
	unsigned int datasz;
	void *data;
};

static int notesize(struct memelfnote *en)
{
	int sz;

	sz = sizeof(struct elf_note);
	sz += roundup(strlen(en->name) + 1, 4);
	sz += roundup(en->datasz, 4);

	return sz;
}

A
Al Viro 已提交
1349
static int writenote(struct memelfnote *men, struct coredump_params *cprm)
1350 1351
{
	struct elf_note en;
L
Linus Torvalds 已提交
1352 1353 1354 1355
	en.n_namesz = strlen(men->name) + 1;
	en.n_descsz = men->datasz;
	en.n_type = men->type;

A
Al Viro 已提交
1356
	return dump_emit(cprm, &en, sizeof(en)) &&
A
Al Viro 已提交
1357 1358
	    dump_emit(cprm, men->name, en.n_namesz) && dump_align(cprm, 4) &&
	    dump_emit(cprm, men->data, men->datasz) && dump_align(cprm, 4);
L
Linus Torvalds 已提交
1359 1360
}

R
Roland McGrath 已提交
1361
static void fill_elf_header(struct elfhdr *elf, int segs,
1362
			    u16 machine, u32 flags)
L
Linus Torvalds 已提交
1363
{
1364 1365
	memset(elf, 0, sizeof(*elf));

L
Linus Torvalds 已提交
1366 1367 1368 1369 1370 1371 1372
	memcpy(elf->e_ident, ELFMAG, SELFMAG);
	elf->e_ident[EI_CLASS] = ELF_CLASS;
	elf->e_ident[EI_DATA] = ELF_DATA;
	elf->e_ident[EI_VERSION] = EV_CURRENT;
	elf->e_ident[EI_OSABI] = ELF_OSABI;

	elf->e_type = ET_CORE;
R
Roland McGrath 已提交
1373
	elf->e_machine = machine;
L
Linus Torvalds 已提交
1374 1375
	elf->e_version = EV_CURRENT;
	elf->e_phoff = sizeof(struct elfhdr);
R
Roland McGrath 已提交
1376
	elf->e_flags = flags;
L
Linus Torvalds 已提交
1377 1378 1379
	elf->e_ehsize = sizeof(struct elfhdr);
	elf->e_phentsize = sizeof(struct elf_phdr);
	elf->e_phnum = segs;
1380

L
Linus Torvalds 已提交
1381 1382 1383
	return;
}

1384
static void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset)
L
Linus Torvalds 已提交
1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407
{
	phdr->p_type = PT_NOTE;
	phdr->p_offset = offset;
	phdr->p_vaddr = 0;
	phdr->p_paddr = 0;
	phdr->p_filesz = sz;
	phdr->p_memsz = 0;
	phdr->p_flags = 0;
	phdr->p_align = 0;
	return;
}

static void fill_note(struct memelfnote *note, const char *name, int type, 
		unsigned int sz, void *data)
{
	note->name = name;
	note->type = type;
	note->datasz = sz;
	note->data = data;
	return;
}

/*
1408 1409
 * fill up all the fields in prstatus from the given task struct, except
 * registers which need to be filled up separately.
L
Linus Torvalds 已提交
1410 1411
 */
static void fill_prstatus(struct elf_prstatus *prstatus,
1412
		struct task_struct *p, long signr)
L
Linus Torvalds 已提交
1413 1414 1415 1416
{
	prstatus->pr_info.si_signo = prstatus->pr_cursig = signr;
	prstatus->pr_sigpend = p->pending.signal.sig[0];
	prstatus->pr_sighold = p->blocked.sig[0];
1417 1418 1419
	rcu_read_lock();
	prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));
	rcu_read_unlock();
1420 1421 1422
	prstatus->pr_pid = task_pid_vnr(p);
	prstatus->pr_pgrp = task_pgrp_vnr(p);
	prstatus->pr_sid = task_session_vnr(p);
L
Linus Torvalds 已提交
1423
	if (thread_group_leader(p)) {
1424 1425
		struct task_cputime cputime;

L
Linus Torvalds 已提交
1426
		/*
1427 1428
		 * This is the record for the group leader.  It shows the
		 * group-wide total, not its individual thread total.
L
Linus Torvalds 已提交
1429
		 */
1430 1431 1432
		thread_group_cputime(p, &cputime);
		cputime_to_timeval(cputime.utime, &prstatus->pr_utime);
		cputime_to_timeval(cputime.stime, &prstatus->pr_stime);
L
Linus Torvalds 已提交
1433
	} else {
1434 1435 1436 1437 1438
		cputime_t utime, stime;

		task_cputime(p, &utime, &stime);
		cputime_to_timeval(utime, &prstatus->pr_utime);
		cputime_to_timeval(stime, &prstatus->pr_stime);
L
Linus Torvalds 已提交
1439 1440 1441 1442 1443 1444 1445 1446
	}
	cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime);
	cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime);
}

static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
		       struct mm_struct *mm)
{
1447
	const struct cred *cred;
1448
	unsigned int i, len;
L
Linus Torvalds 已提交
1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463
	
	/* first copy the parameters from user space */
	memset(psinfo, 0, sizeof(struct elf_prpsinfo));

	len = mm->arg_end - mm->arg_start;
	if (len >= ELF_PRARGSZ)
		len = ELF_PRARGSZ-1;
	if (copy_from_user(&psinfo->pr_psargs,
		           (const char __user *)mm->arg_start, len))
		return -EFAULT;
	for(i = 0; i < len; i++)
		if (psinfo->pr_psargs[i] == 0)
			psinfo->pr_psargs[i] = ' ';
	psinfo->pr_psargs[len] = 0;

1464 1465 1466
	rcu_read_lock();
	psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));
	rcu_read_unlock();
1467 1468 1469
	psinfo->pr_pid = task_pid_vnr(p);
	psinfo->pr_pgrp = task_pgrp_vnr(p);
	psinfo->pr_sid = task_session_vnr(p);
L
Linus Torvalds 已提交
1470 1471 1472

	i = p->state ? ffz(~p->state) + 1 : 0;
	psinfo->pr_state = i;
1473
	psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i];
L
Linus Torvalds 已提交
1474 1475 1476
	psinfo->pr_zomb = psinfo->pr_sname == 'Z';
	psinfo->pr_nice = task_nice(p);
	psinfo->pr_flag = p->flags;
1477 1478
	rcu_read_lock();
	cred = __task_cred(p);
1479 1480
	SET_UID(psinfo->pr_uid, from_kuid_munged(cred->user_ns, cred->uid));
	SET_GID(psinfo->pr_gid, from_kgid_munged(cred->user_ns, cred->gid));
1481
	rcu_read_unlock();
L
Linus Torvalds 已提交
1482 1483 1484 1485 1486
	strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname));
	
	return 0;
}

R
Roland McGrath 已提交
1487 1488 1489 1490 1491 1492 1493 1494 1495 1496
static void fill_auxv_note(struct memelfnote *note, struct mm_struct *mm)
{
	elf_addr_t *auxv = (elf_addr_t *) mm->saved_auxv;
	int i = 0;
	do
		i += 2;
	while (auxv[i - 2] != AT_NULL);
	fill_note(note, "CORE", NT_AUXV, i * sizeof(elf_addr_t), auxv);
}

1497
static void fill_siginfo_note(struct memelfnote *note, user_siginfo_t *csigdata,
A
Al Viro 已提交
1498
		const siginfo_t *siginfo)
1499 1500 1501 1502 1503 1504 1505 1506
{
	mm_segment_t old_fs = get_fs();
	set_fs(KERNEL_DS);
	copy_siginfo_to_user((user_siginfo_t __user *) csigdata, siginfo);
	set_fs(old_fs);
	fill_note(note, "CORE", NT_SIGINFO, sizeof(*csigdata), csigdata);
}

1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518
#define MAX_FILE_NOTE_SIZE (4*1024*1024)
/*
 * Format of NT_FILE note:
 *
 * long count     -- how many files are mapped
 * long page_size -- units for file_ofs
 * array of [COUNT] elements of
 *   long start
 *   long end
 *   long file_ofs
 * followed by COUNT filenames in ASCII: "FILE1" NUL "FILE2" NUL...
 */
1519
static int fill_files_note(struct memelfnote *note)
1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533
{
	struct vm_area_struct *vma;
	unsigned count, size, names_ofs, remaining, n;
	user_long_t *data;
	user_long_t *start_end_ofs;
	char *name_base, *name_curpos;

	/* *Estimated* file count and total data size needed */
	count = current->mm->map_count;
	size = count * 64;

	names_ofs = (2 + 3 * count) * sizeof(data[0]);
 alloc:
	if (size >= MAX_FILE_NOTE_SIZE) /* paranoia check */
1534
		return -EINVAL;
1535 1536 1537
	size = round_up(size, PAGE_SIZE);
	data = vmalloc(size);
	if (!data)
1538
		return -ENOMEM;
1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550

	start_end_ofs = data + 2;
	name_base = name_curpos = ((char *)data) + names_ofs;
	remaining = size - names_ofs;
	count = 0;
	for (vma = current->mm->mmap; vma != NULL; vma = vma->vm_next) {
		struct file *file;
		const char *filename;

		file = vma->vm_file;
		if (!file)
			continue;
M
Miklos Szeredi 已提交
1551
		filename = file_path(file, name_curpos, remaining);
1552 1553 1554 1555 1556 1557 1558 1559 1560
		if (IS_ERR(filename)) {
			if (PTR_ERR(filename) == -ENAMETOOLONG) {
				vfree(data);
				size = size * 5 / 4;
				goto alloc;
			}
			continue;
		}

M
Miklos Szeredi 已提交
1561
		/* file_path() fills at the end, move name down */
1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590
		/* n = strlen(filename) + 1: */
		n = (name_curpos + remaining) - filename;
		remaining = filename - name_curpos;
		memmove(name_curpos, filename, n);
		name_curpos += n;

		*start_end_ofs++ = vma->vm_start;
		*start_end_ofs++ = vma->vm_end;
		*start_end_ofs++ = vma->vm_pgoff;
		count++;
	}

	/* Now we know exact count of files, can store it */
	data[0] = count;
	data[1] = PAGE_SIZE;
	/*
	 * Count usually is less than current->mm->map_count,
	 * we need to move filenames down.
	 */
	n = current->mm->map_count - count;
	if (n != 0) {
		unsigned shift_bytes = n * 3 * sizeof(data[0]);
		memmove(name_base - shift_bytes, name_base,
			name_curpos - name_base);
		name_curpos -= shift_bytes;
	}

	size = name_curpos - (char *)data;
	fill_note(note, "CORE", NT_FILE, size, data);
1591
	return 0;
1592 1593
}

1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606
#ifdef CORE_DUMP_USE_REGSET
#include <linux/regset.h>

struct elf_thread_core_info {
	struct elf_thread_core_info *next;
	struct task_struct *task;
	struct elf_prstatus prstatus;
	struct memelfnote notes[0];
};

struct elf_note_info {
	struct elf_thread_core_info *thread;
	struct memelfnote psinfo;
1607
	struct memelfnote signote;
1608
	struct memelfnote auxv;
1609
	struct memelfnote files;
1610
	user_siginfo_t csigdata;
1611 1612 1613 1614
	size_t size;
	int thread_notes;
};

1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626
/*
 * When a regset has a writeback hook, we call it on each thread before
 * dumping user memory.  On register window machines, this makes sure the
 * user memory backing the register data is up to date before we read it.
 */
static void do_thread_regset_writeback(struct task_struct *task,
				       const struct user_regset *regset)
{
	if (regset->writeback)
		regset->writeback(task, regset, 1);
}

1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642
#ifndef PR_REG_SIZE
#define PR_REG_SIZE(S) sizeof(S)
#endif

#ifndef PRSTATUS_SIZE
#define PRSTATUS_SIZE(S) sizeof(S)
#endif

#ifndef PR_REG_PTR
#define PR_REG_PTR(S) (&((S)->pr_reg))
#endif

#ifndef SET_PR_FPVALID
#define SET_PR_FPVALID(S, V) ((S)->pr_fpvalid = (V))
#endif

1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656
static int fill_thread_core_info(struct elf_thread_core_info *t,
				 const struct user_regset_view *view,
				 long signr, size_t *total)
{
	unsigned int i;

	/*
	 * NT_PRSTATUS is the one special case, because the regset data
	 * goes into the pr_reg field inside the note contents, rather
	 * than being the whole note contents.  We fill the reset in here.
	 * We assume that regset 0 is NT_PRSTATUS.
	 */
	fill_prstatus(&t->prstatus, t->task, signr);
	(void) view->regsets[0].get(t->task, &view->regsets[0],
1657 1658
				    0, PR_REG_SIZE(t->prstatus.pr_reg),
				    PR_REG_PTR(&t->prstatus), NULL);
1659 1660

	fill_note(&t->notes[0], "CORE", NT_PRSTATUS,
1661
		  PRSTATUS_SIZE(t->prstatus), &t->prstatus);
1662 1663
	*total += notesize(&t->notes[0]);

1664 1665
	do_thread_regset_writeback(t->task, &view->regsets[0]);

1666 1667 1668 1669 1670 1671 1672
	/*
	 * Each other regset might generate a note too.  For each regset
	 * that has no core_note_type or is inactive, we leave t->notes[i]
	 * all zero and we'll know to skip writing it later.
	 */
	for (i = 1; i < view->n; ++i) {
		const struct user_regset *regset = &view->regsets[i];
1673
		do_thread_regset_writeback(t->task, regset);
1674
		if (regset->core_note_type && regset->get &&
1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690
		    (!regset->active || regset->active(t->task, regset))) {
			int ret;
			size_t size = regset->n * regset->size;
			void *data = kmalloc(size, GFP_KERNEL);
			if (unlikely(!data))
				return 0;
			ret = regset->get(t->task, regset,
					  0, size, data, NULL);
			if (unlikely(ret))
				kfree(data);
			else {
				if (regset->core_note_type != NT_PRFPREG)
					fill_note(&t->notes[i], "LINUX",
						  regset->core_note_type,
						  size, data);
				else {
1691
					SET_PR_FPVALID(&t->prstatus, 1);
1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704
					fill_note(&t->notes[i], "CORE",
						  NT_PRFPREG, size, data);
				}
				*total += notesize(&t->notes[i]);
			}
		}
	}

	return 1;
}

static int fill_note_info(struct elfhdr *elf, int phdrs,
			  struct elf_note_info *info,
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			  const siginfo_t *siginfo, struct pt_regs *regs)
1706 1707 1708 1709 1710
{
	struct task_struct *dump_task = current;
	const struct user_regset_view *view = task_user_regset_view(dump_task);
	struct elf_thread_core_info *t;
	struct elf_prpsinfo *psinfo;
1711
	struct core_thread *ct;
1712 1713 1714 1715 1716 1717
	unsigned int i;

	info->size = 0;
	info->thread = NULL;

	psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL);
1718 1719
	if (psinfo == NULL) {
		info->psinfo.data = NULL; /* So we don't free this wrongly */
1720
		return 0;
1721
	}
1722

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1723 1724
	fill_note(&info->psinfo, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo);

1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746
	/*
	 * Figure out how many notes we're going to need for each thread.
	 */
	info->thread_notes = 0;
	for (i = 0; i < view->n; ++i)
		if (view->regsets[i].core_note_type != 0)
			++info->thread_notes;

	/*
	 * Sanity check.  We rely on regset 0 being in NT_PRSTATUS,
	 * since it is our one special case.
	 */
	if (unlikely(info->thread_notes == 0) ||
	    unlikely(view->regsets[0].core_note_type != NT_PRSTATUS)) {
		WARN_ON(1);
		return 0;
	}

	/*
	 * Initialize the ELF file header.
	 */
	fill_elf_header(elf, phdrs,
1747
			view->e_machine, view->e_flags);
1748 1749 1750 1751

	/*
	 * Allocate a structure for each thread.
	 */
1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769
	for (ct = &dump_task->mm->core_state->dumper; ct; ct = ct->next) {
		t = kzalloc(offsetof(struct elf_thread_core_info,
				     notes[info->thread_notes]),
			    GFP_KERNEL);
		if (unlikely(!t))
			return 0;

		t->task = ct->task;
		if (ct->task == dump_task || !info->thread) {
			t->next = info->thread;
			info->thread = t;
		} else {
			/*
			 * Make sure to keep the original task at
			 * the head of the list.
			 */
			t->next = info->thread->next;
			info->thread->next = t;
1770
		}
1771
	}
1772 1773 1774 1775 1776

	/*
	 * Now fill in each thread's information.
	 */
	for (t = info->thread; t != NULL; t = t->next)
1777
		if (!fill_thread_core_info(t, view, siginfo->si_signo, &info->size))
1778 1779 1780 1781 1782 1783 1784 1785
			return 0;

	/*
	 * Fill in the two process-wide notes.
	 */
	fill_psinfo(psinfo, dump_task->group_leader, dump_task->mm);
	info->size += notesize(&info->psinfo);

1786 1787 1788
	fill_siginfo_note(&info->signote, &info->csigdata, siginfo);
	info->size += notesize(&info->signote);

1789 1790 1791
	fill_auxv_note(&info->auxv, current->mm);
	info->size += notesize(&info->auxv);

1792 1793
	if (fill_files_note(&info->files) == 0)
		info->size += notesize(&info->files);
1794

1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807
	return 1;
}

static size_t get_note_info_size(struct elf_note_info *info)
{
	return info->size;
}

/*
 * Write all the notes for each thread.  When writing the first thread, the
 * process-wide notes are interleaved after the first thread-specific note.
 */
static int write_note_info(struct elf_note_info *info,
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Al Viro 已提交
1808
			   struct coredump_params *cprm)
1809
{
1810
	bool first = true;
1811 1812 1813 1814 1815
	struct elf_thread_core_info *t = info->thread;

	do {
		int i;

A
Al Viro 已提交
1816
		if (!writenote(&t->notes[0], cprm))
1817 1818
			return 0;

A
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		if (first && !writenote(&info->psinfo, cprm))
1820
			return 0;
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1821
		if (first && !writenote(&info->signote, cprm))
1822
			return 0;
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		if (first && !writenote(&info->auxv, cprm))
1824
			return 0;
1825
		if (first && info->files.data &&
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Al Viro 已提交
1826
				!writenote(&info->files, cprm))
1827
			return 0;
1828 1829 1830

		for (i = 1; i < info->thread_notes; ++i)
			if (t->notes[i].data &&
A
Al Viro 已提交
1831
			    !writenote(&t->notes[i], cprm))
1832 1833
				return 0;

1834
		first = false;
1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853
		t = t->next;
	} while (t);

	return 1;
}

static void free_note_info(struct elf_note_info *info)
{
	struct elf_thread_core_info *threads = info->thread;
	while (threads) {
		unsigned int i;
		struct elf_thread_core_info *t = threads;
		threads = t->next;
		WARN_ON(t->notes[0].data && t->notes[0].data != &t->prstatus);
		for (i = 1; i < info->thread_notes; ++i)
			kfree(t->notes[i].data);
		kfree(t);
	}
	kfree(info->psinfo.data);
1854
	vfree(info->files.data);
1855 1856 1857 1858
}

#else

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/* Here is the structure in which status of each thread is captured. */
struct elf_thread_status
{
	struct list_head list;
	struct elf_prstatus prstatus;	/* NT_PRSTATUS */
	elf_fpregset_t fpu;		/* NT_PRFPREG */
	struct task_struct *thread;
#ifdef ELF_CORE_COPY_XFPREGS
1867
	elf_fpxregset_t xfpu;		/* ELF_CORE_XFPREG_TYPE */
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#endif
	struct memelfnote notes[3];
	int num_notes;
};

/*
 * In order to add the specific thread information for the elf file format,
1875 1876
 * we need to keep a linked list of every threads pr_status and then create
 * a single section for them in the final core file.
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 */
static int elf_dump_thread_status(long signr, struct elf_thread_status *t)
{
	int sz = 0;
	struct task_struct *p = t->thread;
	t->num_notes = 0;

	fill_prstatus(&t->prstatus, p, signr);
	elf_core_copy_task_regs(p, &t->prstatus.pr_reg);	
	
1887 1888
	fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus),
		  &(t->prstatus));
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	t->num_notes++;
	sz += notesize(&t->notes[0]);

1892 1893 1894 1895
	if ((t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL,
								&t->fpu))) {
		fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu),
			  &(t->fpu));
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		t->num_notes++;
		sz += notesize(&t->notes[1]);
	}

#ifdef ELF_CORE_COPY_XFPREGS
	if (elf_core_copy_task_xfpregs(p, &t->xfpu)) {
1902 1903
		fill_note(&t->notes[2], "LINUX", ELF_CORE_XFPREG_TYPE,
			  sizeof(t->xfpu), &t->xfpu);
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		t->num_notes++;
		sz += notesize(&t->notes[2]);
	}
#endif	
	return sz;
}

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struct elf_note_info {
	struct memelfnote *notes;
1913
	struct memelfnote *notes_files;
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	struct elf_prstatus *prstatus;	/* NT_PRSTATUS */
	struct elf_prpsinfo *psinfo;	/* NT_PRPSINFO */
	struct list_head thread_list;
	elf_fpregset_t *fpu;
#ifdef ELF_CORE_COPY_XFPREGS
	elf_fpxregset_t *xfpu;
#endif
1921
	user_siginfo_t csigdata;
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	int thread_status_size;
	int numnote;
};

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static int elf_note_info_init(struct elf_note_info *info)
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Roland McGrath 已提交
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{
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1928
	memset(info, 0, sizeof(*info));
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1929 1930
	INIT_LIST_HEAD(&info->thread_list);

1931
	/* Allocate space for ELF notes */
1932
	info->notes = kmalloc(8 * sizeof(struct memelfnote), GFP_KERNEL);
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	if (!info->notes)
		return 0;
	info->psinfo = kmalloc(sizeof(*info->psinfo), GFP_KERNEL);
	if (!info->psinfo)
1937
		return 0;
R
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	info->prstatus = kmalloc(sizeof(*info->prstatus), GFP_KERNEL);
	if (!info->prstatus)
1940
		return 0;
R
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	info->fpu = kmalloc(sizeof(*info->fpu), GFP_KERNEL);
	if (!info->fpu)
1943
		return 0;
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#ifdef ELF_CORE_COPY_XFPREGS
	info->xfpu = kmalloc(sizeof(*info->xfpu), GFP_KERNEL);
	if (!info->xfpu)
1947
		return 0;
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#endif
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	return 1;
}

static int fill_note_info(struct elfhdr *elf, int phdrs,
			  struct elf_note_info *info,
A
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1954
			  const siginfo_t *siginfo, struct pt_regs *regs)
A
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1955 1956
{
	struct list_head *t;
1957 1958
	struct core_thread *ct;
	struct elf_thread_status *ets;
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Amerigo Wang 已提交
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	if (!elf_note_info_init(info))
		return 0;
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1963 1964 1965 1966 1967
	for (ct = current->mm->core_state->dumper.next;
					ct; ct = ct->next) {
		ets = kzalloc(sizeof(*ets), GFP_KERNEL);
		if (!ets)
			return 0;
1968

1969 1970 1971
		ets->thread = ct->task;
		list_add(&ets->list, &info->thread_list);
	}
1972

1973 1974
	list_for_each(t, &info->thread_list) {
		int sz;
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1976 1977 1978
		ets = list_entry(t, struct elf_thread_status, list);
		sz = elf_dump_thread_status(siginfo->si_signo, ets);
		info->thread_status_size += sz;
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	}
	/* now collect the dump for the current */
	memset(info->prstatus, 0, sizeof(*info->prstatus));
1982
	fill_prstatus(info->prstatus, current, siginfo->si_signo);
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Roland McGrath 已提交
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	elf_core_copy_regs(&info->prstatus->pr_reg, regs);

	/* Set up header */
1986
	fill_elf_header(elf, phdrs, ELF_ARCH, ELF_CORE_EFLAGS);
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1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998

	/*
	 * Set up the notes in similar form to SVR4 core dumps made
	 * with info from their /proc.
	 */

	fill_note(info->notes + 0, "CORE", NT_PRSTATUS,
		  sizeof(*info->prstatus), info->prstatus);
	fill_psinfo(info->psinfo, current->group_leader, current->mm);
	fill_note(info->notes + 1, "CORE", NT_PRPSINFO,
		  sizeof(*info->psinfo), info->psinfo);

1999 2000
	fill_siginfo_note(info->notes + 2, &info->csigdata, siginfo);
	fill_auxv_note(info->notes + 3, current->mm);
2001
	info->numnote = 4;
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Roland McGrath 已提交
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2003 2004 2005 2006
	if (fill_files_note(info->notes + info->numnote) == 0) {
		info->notes_files = info->notes + info->numnote;
		info->numnote++;
	}
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2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037

	/* Try to dump the FPU. */
	info->prstatus->pr_fpvalid = elf_core_copy_task_fpregs(current, regs,
							       info->fpu);
	if (info->prstatus->pr_fpvalid)
		fill_note(info->notes + info->numnote++,
			  "CORE", NT_PRFPREG, sizeof(*info->fpu), info->fpu);
#ifdef ELF_CORE_COPY_XFPREGS
	if (elf_core_copy_task_xfpregs(current, info->xfpu))
		fill_note(info->notes + info->numnote++,
			  "LINUX", ELF_CORE_XFPREG_TYPE,
			  sizeof(*info->xfpu), info->xfpu);
#endif

	return 1;
}

static size_t get_note_info_size(struct elf_note_info *info)
{
	int sz = 0;
	int i;

	for (i = 0; i < info->numnote; i++)
		sz += notesize(info->notes + i);

	sz += info->thread_status_size;

	return sz;
}

static int write_note_info(struct elf_note_info *info,
A
Al Viro 已提交
2038
			   struct coredump_params *cprm)
R
Roland McGrath 已提交
2039 2040 2041 2042 2043
{
	int i;
	struct list_head *t;

	for (i = 0; i < info->numnote; i++)
A
Al Viro 已提交
2044
		if (!writenote(info->notes + i, cprm))
R
Roland McGrath 已提交
2045 2046 2047 2048 2049 2050 2051 2052
			return 0;

	/* write out the thread status notes section */
	list_for_each(t, &info->thread_list) {
		struct elf_thread_status *tmp =
				list_entry(t, struct elf_thread_status, list);

		for (i = 0; i < tmp->num_notes; i++)
A
Al Viro 已提交
2053
			if (!writenote(&tmp->notes[i], cprm))
R
Roland McGrath 已提交
2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067
				return 0;
	}

	return 1;
}

static void free_note_info(struct elf_note_info *info)
{
	while (!list_empty(&info->thread_list)) {
		struct list_head *tmp = info->thread_list.next;
		list_del(tmp);
		kfree(list_entry(tmp, struct elf_thread_status, list));
	}

2068 2069 2070
	/* Free data possibly allocated by fill_files_note(): */
	if (info->notes_files)
		vfree(info->notes_files->data);
2071

R
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2072 2073 2074 2075 2076 2077 2078 2079 2080
	kfree(info->prstatus);
	kfree(info->psinfo);
	kfree(info->notes);
	kfree(info->fpu);
#ifdef ELF_CORE_COPY_XFPREGS
	kfree(info->xfpu);
#endif
}

2081 2082
#endif

2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108
static struct vm_area_struct *first_vma(struct task_struct *tsk,
					struct vm_area_struct *gate_vma)
{
	struct vm_area_struct *ret = tsk->mm->mmap;

	if (ret)
		return ret;
	return gate_vma;
}
/*
 * Helper function for iterating across a vma list.  It ensures that the caller
 * will visit `gate_vma' prior to terminating the search.
 */
static struct vm_area_struct *next_vma(struct vm_area_struct *this_vma,
					struct vm_area_struct *gate_vma)
{
	struct vm_area_struct *ret;

	ret = this_vma->vm_next;
	if (ret)
		return ret;
	if (this_vma == gate_vma)
		return NULL;
	return gate_vma;
}

2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124
static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum,
			     elf_addr_t e_shoff, int segs)
{
	elf->e_shoff = e_shoff;
	elf->e_shentsize = sizeof(*shdr4extnum);
	elf->e_shnum = 1;
	elf->e_shstrndx = SHN_UNDEF;

	memset(shdr4extnum, 0, sizeof(*shdr4extnum));

	shdr4extnum->sh_type = SHT_NULL;
	shdr4extnum->sh_size = elf->e_shnum;
	shdr4extnum->sh_link = elf->e_shstrndx;
	shdr4extnum->sh_info = segs;
}

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/*
 * Actual dumper
 *
 * This is a two-pass process; first we find the offsets of the bits,
 * and then they are actually written out.  If we run out of core limit
 * we just truncate.
 */
2132
static int elf_core_dump(struct coredump_params *cprm)
L
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2133 2134 2135
{
	int has_dumped = 0;
	mm_segment_t fs;
2136 2137
	int segs, i;
	size_t vma_data_size = 0;
2138
	struct vm_area_struct *vma, *gate_vma;
L
Linus Torvalds 已提交
2139
	struct elfhdr *elf = NULL;
2140
	loff_t offset = 0, dataoff;
2141
	struct elf_note_info info = { };
2142
	struct elf_phdr *phdr4note = NULL;
2143 2144 2145
	struct elf_shdr *shdr4extnum = NULL;
	Elf_Half e_phnum;
	elf_addr_t e_shoff;
2146
	elf_addr_t *vma_filesz = NULL;
L
Linus Torvalds 已提交
2147 2148 2149 2150

	/*
	 * We no longer stop all VM operations.
	 * 
2151 2152 2153
	 * This is because those proceses that could possibly change map_count
	 * or the mmap / vma pages are now blocked in do_exit on current
	 * finishing this core dump.
L
Linus Torvalds 已提交
2154 2155
	 *
	 * Only ptrace can touch these memory addresses, but it doesn't change
2156
	 * the map_count or the pages allocated. So no possibility of crashing
L
Linus Torvalds 已提交
2157 2158 2159 2160 2161 2162
	 * exists while dumping the mm->vm_next areas to the core file.
	 */
  
	/* alloc memory for large data structures: too large to be on stack */
	elf = kmalloc(sizeof(*elf), GFP_KERNEL);
	if (!elf)
2163
		goto out;
2164 2165 2166 2167
	/*
	 * The number of segs are recored into ELF header as 16bit value.
	 * Please check DEFAULT_MAX_MAP_COUNT definition when you modify here.
	 */
L
Linus Torvalds 已提交
2168
	segs = current->mm->map_count;
2169
	segs += elf_core_extra_phdrs();
L
Linus Torvalds 已提交
2170

2171
	gate_vma = get_gate_vma(current->mm);
2172 2173 2174
	if (gate_vma != NULL)
		segs++;

2175 2176 2177 2178 2179 2180 2181 2182
	/* for notes section */
	segs++;

	/* If segs > PN_XNUM(0xffff), then e_phnum overflows. To avoid
	 * this, kernel supports extended numbering. Have a look at
	 * include/linux/elf.h for further information. */
	e_phnum = segs > PN_XNUM ? PN_XNUM : segs;

L
Linus Torvalds 已提交
2183
	/*
R
Roland McGrath 已提交
2184 2185
	 * Collect all the non-memory information about the process for the
	 * notes.  This also sets up the file header.
L
Linus Torvalds 已提交
2186
	 */
2187
	if (!fill_note_info(elf, e_phnum, &info, cprm->siginfo, cprm->regs))
R
Roland McGrath 已提交
2188
		goto cleanup;
L
Linus Torvalds 已提交
2189

R
Roland McGrath 已提交
2190
	has_dumped = 1;
2191

L
Linus Torvalds 已提交
2192 2193 2194 2195
	fs = get_fs();
	set_fs(KERNEL_DS);

	offset += sizeof(*elf);				/* Elf header */
2196
	offset += segs * sizeof(struct elf_phdr);	/* Program headers */
L
Linus Torvalds 已提交
2197 2198 2199

	/* Write notes phdr entry */
	{
R
Roland McGrath 已提交
2200
		size_t sz = get_note_info_size(&info);
L
Linus Torvalds 已提交
2201

2202
		sz += elf_coredump_extra_notes_size();
2203

2204 2205
		phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL);
		if (!phdr4note)
2206
			goto end_coredump;
2207 2208 2209

		fill_elf_note_phdr(phdr4note, sz, offset);
		offset += sz;
L
Linus Torvalds 已提交
2210 2211 2212 2213
	}

	dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE);

2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227
	vma_filesz = kmalloc_array(segs - 1, sizeof(*vma_filesz), GFP_KERNEL);
	if (!vma_filesz)
		goto end_coredump;

	for (i = 0, vma = first_vma(current, gate_vma); vma != NULL;
			vma = next_vma(vma, gate_vma)) {
		unsigned long dump_size;

		dump_size = vma_dump_size(vma, cprm->mm_flags);
		vma_filesz[i++] = dump_size;
		vma_data_size += dump_size;
	}

	offset += vma_data_size;
2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239
	offset += elf_core_extra_data_size();
	e_shoff = offset;

	if (e_phnum == PN_XNUM) {
		shdr4extnum = kmalloc(sizeof(*shdr4extnum), GFP_KERNEL);
		if (!shdr4extnum)
			goto end_coredump;
		fill_extnum_info(elf, shdr4extnum, e_shoff, segs);
	}

	offset = dataoff;

A
Al Viro 已提交
2240
	if (!dump_emit(cprm, elf, sizeof(*elf)))
2241 2242
		goto end_coredump;

A
Al Viro 已提交
2243
	if (!dump_emit(cprm, phdr4note, sizeof(*phdr4note)))
2244 2245
		goto end_coredump;

L
Linus Torvalds 已提交
2246
	/* Write program headers for segments dump */
2247
	for (i = 0, vma = first_vma(current, gate_vma); vma != NULL;
2248
			vma = next_vma(vma, gate_vma)) {
L
Linus Torvalds 已提交
2249 2250 2251 2252 2253 2254
		struct elf_phdr phdr;

		phdr.p_type = PT_LOAD;
		phdr.p_offset = offset;
		phdr.p_vaddr = vma->vm_start;
		phdr.p_paddr = 0;
2255
		phdr.p_filesz = vma_filesz[i++];
R
Roland McGrath 已提交
2256
		phdr.p_memsz = vma->vm_end - vma->vm_start;
L
Linus Torvalds 已提交
2257 2258
		offset += phdr.p_filesz;
		phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0;
2259 2260 2261 2262
		if (vma->vm_flags & VM_WRITE)
			phdr.p_flags |= PF_W;
		if (vma->vm_flags & VM_EXEC)
			phdr.p_flags |= PF_X;
L
Linus Torvalds 已提交
2263 2264
		phdr.p_align = ELF_EXEC_PAGESIZE;

A
Al Viro 已提交
2265
		if (!dump_emit(cprm, &phdr, sizeof(phdr)))
2266
			goto end_coredump;
L
Linus Torvalds 已提交
2267 2268
	}

2269
	if (!elf_core_write_extra_phdrs(cprm, offset))
2270
		goto end_coredump;
L
Linus Torvalds 已提交
2271 2272

 	/* write out the notes section */
A
Al Viro 已提交
2273
	if (!write_note_info(&info, cprm))
R
Roland McGrath 已提交
2274
		goto end_coredump;
L
Linus Torvalds 已提交
2275

2276
	if (elf_coredump_extra_notes_write(cprm))
2277
		goto end_coredump;
2278

2279
	/* Align to page */
2280
	if (!dump_skip(cprm, dataoff - cprm->pos))
H
Hugh Dickins 已提交
2281
		goto end_coredump;
L
Linus Torvalds 已提交
2282

2283
	for (i = 0, vma = first_vma(current, gate_vma); vma != NULL;
2284
			vma = next_vma(vma, gate_vma)) {
L
Linus Torvalds 已提交
2285
		unsigned long addr;
R
Roland McGrath 已提交
2286
		unsigned long end;
L
Linus Torvalds 已提交
2287

2288
		end = vma->vm_start + vma_filesz[i++];
L
Linus Torvalds 已提交
2289

R
Roland McGrath 已提交
2290
		for (addr = vma->vm_start; addr < end; addr += PAGE_SIZE) {
2291
			struct page *page;
H
Hugh Dickins 已提交
2292 2293 2294 2295 2296
			int stop;

			page = get_dump_page(addr);
			if (page) {
				void *kaddr = kmap(page);
2297
				stop = !dump_emit(cprm, kaddr, PAGE_SIZE);
H
Hugh Dickins 已提交
2298
				kunmap(page);
2299
				put_page(page);
H
Hugh Dickins 已提交
2300
			} else
2301
				stop = !dump_skip(cprm, PAGE_SIZE);
H
Hugh Dickins 已提交
2302 2303
			if (stop)
				goto end_coredump;
L
Linus Torvalds 已提交
2304 2305 2306
		}
	}

2307
	if (!elf_core_write_extra_data(cprm))
2308
		goto end_coredump;
L
Linus Torvalds 已提交
2309

2310
	if (e_phnum == PN_XNUM) {
2311
		if (!dump_emit(cprm, shdr4extnum, sizeof(*shdr4extnum)))
2312 2313 2314
			goto end_coredump;
	}

L
Linus Torvalds 已提交
2315 2316 2317 2318
end_coredump:
	set_fs(fs);

cleanup:
R
Roland McGrath 已提交
2319
	free_note_info(&info);
2320
	kfree(shdr4extnum);
2321
	kfree(vma_filesz);
2322
	kfree(phdr4note);
2323 2324
	kfree(elf);
out:
L
Linus Torvalds 已提交
2325 2326 2327
	return has_dumped;
}

C
Christoph Hellwig 已提交
2328
#endif		/* CONFIG_ELF_CORE */
L
Linus Torvalds 已提交
2329 2330 2331

static int __init init_elf_binfmt(void)
{
A
Al Viro 已提交
2332 2333
	register_binfmt(&elf_format);
	return 0;
L
Linus Torvalds 已提交
2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344
}

static void __exit exit_elf_binfmt(void)
{
	/* Remove the COFF and ELF loaders. */
	unregister_binfmt(&elf_format);
}

core_initcall(init_elf_binfmt);
module_exit(exit_elf_binfmt);
MODULE_LICENSE("GPL");